Hybrid Power Generation Feedforward Control for Grid Frequency Stability
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Solution Overview
Problem
In hybrid power generation systems, rapid fluctuations in renewable energy sources like solar or wind energy lead to decreased output frequency, necessitating disconnection of rotary power generation devices, which destabilizes power generation and requires expensive high-capacity electric storage devices to maintain stability.
Innovation Solution
A hybrid power generation system with a control device that calculates a correction value to adjust the rotary power generation device's rotation speed using a feedforward component, reducing the need for high-capacity storage devices by anticipating and mitigating output fluctuations through feedback and feedforward control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a rotary power generation device is used to stabilize power generation output, then power generation stability is improved, but when renewable energy fluctuates rapidly, the rotation speed decreases causing output frequency to drop, leading to disconnection from the power system
Solution Approach 1:
The control device calculates a correction value based on the fluctuation amount of renewable energy before the rotation speed actually decreases. This feedforward control anticipates the fluctuation and adjusts the rotary power generation device's output in advance, preventing the rotation speed drop that would otherwise cause disconnection from the power system
Solution Approach 2:
The control device uses feedback control to monitor the actual rotation speed and compare it with the target rotation speed. The feedback signal is used to adjust the control parameter, ensuring the rotation speed remains stable even when renewable energy fluctuates, thereby maintaining connection reliability to the power system
2Stability of the object's composition
If a high-capacity electric storage device is used to stabilize power generation output, then power generation stability is improved, but the system cost increases significantly
Solution Approach 1:
The patent replaces the mechanical/electrical storage system with a control-based solution. Instead of using a high-capacity electric storage device to absorb fluctuations, the system uses a control device that calculates correction values and adjusts the rotary power generation device's output in real-time, achieving the same stabilization effect without the expensive storage infrastructure
Solution Approach 2:
The control device dynamically changes the control parameter of the rotary power generation device based on the fluctuation amount of renewable energy. By adjusting parameters such as the control parameter (which affects rotation speed and output), the system adapts to fluctuating conditions and maintains stable power generation output without requiring additional storage capacity
Data Source
AI summary
The hybrid power generation system includes a renewable energy power generation device and a rotary power generation device connected to a common alternating-current power system. In the system, if renewable energy or an output fluctuates, a correction value calculated based on the fluctuation amount is added to a control parameter as a feedforward component, controlling the rotary power generation device.